31927939 has 2 divisors, whose sum is σ = 31927940. Its totient is φ = 31927938.

The previous prime is 31927913. The next prime is 31927957. The reversal of 31927939 is 93972913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31927939 - 2¹³ = 31919747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31927895 and 31927904.

It is not a weakly prime, because it can be changed into another prime (31927039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15963969 + 15963970.

It is an arithmetic number, because the mean of its divisors is an integer number (15963970).

Almost surely, 2^31927939 is an apocalyptic number.

31927939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31927939 is an equidigital number, since it uses as much as digits as its factorization.

31927939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 43.

The square root of 31927939 is about 5650.4813069331. The cubic root of 31927939 is about 317.2417193942.

The spelling of 31927939 in words is "thirty-one million, nine hundred twenty-seven thousand, nine hundred thirty-nine".